We consider Monte Carlo methods for the classical nonlinear
filtering problem. The first method is based on a backward
pathwise filtering equation and the second method is related to a
backward linear stochastic partial differential equation. We study
convergence of the proposed numerical algorithms. The considered
methods have such advantages as a capability in principle to solve
filtering problems of large dimensionality, reliable error
control, and recurrency. Their efficiency is achieved due to the
numerical procedures which use effective numerical schemes and
variance reduction techniques. The results obtained are supported
by numerical experiments.
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